© 2008 Autodesk

BIM for Civil Engineering08/07/2009

Yoshihiko Fukuchi, Ph.D. Industry Solutions Manager, AEC‐IM PLG, Autodesk Inc.

BIM is an integrated process built on coordinated, reliable information about a project from design through construction and into operations.

– Create coordinated, digital design information and documentation. 

– Predict performance, appearance, and cost.                            

– Deliver the project faster, more economically, and with reduced environmental impact.

BUILDINGINFORMATIONMODELING ARCHITECTS

STRUCTURALENGINEERS

MEP SYSTEMSENGINEERS

BUILDERS

OWNERS

CIVILENGINEERS

Building Information Modeling (BIM)Building Information Modeling (BIM)

BIM & Model‐based Design

Benefits of BIM for Civil Engineering

Model‐based Process

Model‐centric Process

Accuracy•Ability to speed up design to construction process •Quantities/Takeoff – more accurate takeoff of materials and components versus manual counting•Reduction of errors, omissions, collisions – reducing risk and liability as mistakes found in office not field•Rapid reset should design need to change – production of plans, or updated information

This is CAD This is BIM 

Visualization•Reduced time converting 2D to 3D for Visualization•Uses of Visualization

•Agency/Owner presentation•Marketing•Public Meetings/Google Earth

Conventional Way: banks and verges 

Machine Control•Export of Design data to Machine Control 

•Time to construction – from weeks to hours for machines to begin rolling, changes mid stream rationalized in hours not weeks

•Export of Design Data to GPS/Robotics•Inspection•XYZ coordinates for construction layout and control•Construction project progress tracking, material tracking, daily QA/QC of construction to design model

•Risk Mgmt•Performance verification

AccuGrade Way 

Grade Checking of Base CourseGrade Checking of Base Course

High: 15%

Low: 30%

On Grade: 45%0 33 66

Conventional

High: 2%

Low: 0%

On Grade: 98%0 33 66

AccuGrade

Three points every 5m were surveyed A tolerance of ± 2cm was applied

Summary Summary of Resultsof Results

D6N - Operating Times

0

2

4

6

8

10

12

Conventional AccuGrade

hour

s

BaseSubgrade

02:24

08:28

05:46

01:28

330D - Operating Times

0

1

2

3

4

5

6

Conventional AccuGrade

Subgrade

05:19

04:36

140H - Machine Operation

0

0.5

1

1.5

2

Conventional AccuGrade

Base

01:49

00:32

Site Setup (Staking / Data Prep)

00:00

01:12

02:24

03:36

04:48

06:00

07:12

08:24

Conventional AccuGrade

Site Setup

07:31

00:54

Conventional24:32 hrs

AccuGrade11:50 hrs

Summary Summary of Results of Results 100% Increase in Productivity

3,0 days vs. 1,5 days

Increased Machine UtilizationLess waiting timeLonger passes

Savings in Operating Cost43% less Fuel consumption

22

210231

0

50

100

150

200

250

330D D6N 140H

7

136123

0

50

100

150

200

250

330D D6N 140H

Conventional

AccuGrade

43% fuel savings

Summary Summary of Results of Results Reduction in Surveying Cost

18 hrs & 14 min. X 2 people (Old way) vs.. 54 min. for 1 person (New way): 95% time saved and 1 person less.

Increased quality / potential for material saving45% in tolerance vs.. 98% in tolerance & much more consistentVerges and side slopes visually looked much better with AccuGrade9 Trucks vs.. 8 Trucks over 80M – 11% savings

Conventional AccuGrade

Laser Scanning (LIDAR)

•Scan existing conditions for Design parameters/As‐builts•Safety paramount (performed from safe location)•Scanning during construction to verify progress to model for % complete •Scanning during construction for verification of as‐built vs. as design 

Quantities for Estimating and Production /Cost Control

•Optimization of Cut/Fill•Haul Road analysis•Wetland/Environmental mitigation•Quantity extraction of materials (concrete/rebar/rock/guardrail/walls/etc.)•More sustainable – wiser use and less material waste when ordering 

Construction Simulation•Sequencing•Lane closures•4D Planning•Equipment and Material schedule optimization

15© 2006 Autodesk

Bay Bridge ‐ 4D Planning Equipment and Material schedule optimization

16© 2006 Autodesk

Tottenham Court Road Station, London

17© 2006 Autodesk

Tottenham Court Road Station‐ 4D Planning Sequencing

Collaboration:•Project team sharing of model

•Currency of the model•Clash Avoidance•Utility/Contractor information sharing

Results – Savings from Clash Detection

CLASH # DESCRIPTION POTENTIAL COSTS1 Grid dimensions were wrong $10,000.002 A-Basin - Shortened Corbel along side wall $2,000.003 A-Basin - Beam pockets sizes4 A-Basin + Membrane - being able to see the section at the channel deck and wall joints. Priceless!5 Headworks - Grit Chambers ftgs./eliminated underslab $5,000.006 Headworks - Sluice Gates blockout sizes and location7 Admin. - Battered walls needed to be elongated due to clash with Curtain Walls $10,000.008 Admin. - Columns in the middle of the 2 main center walls were in the wrong place $5,000.009 Admin. - Chase blockouts on plans were not big enough for all HVACs and Electrical to go through. $5,000.0010 Admin. - By putting in steel beams we were able to see what size blockout and plates were needed, caught $5,000.00

mistake from Able Steel in the process.11 Admin - Eliminated steel beam ?12 Admin. - Ftgs and stems were layed out incorrectly on plans and were wrong size. $25,000.0013 By modeling the masonry we were able to lay out all the door and louver openings.14 Modeling piping & ductbanks $150,000.00

TOTAL SAVINGS $217,000.00

Butler Treatment Plant Clash Savings

Detailing & Prefabrication:•Concrete lift drawings•Rebar detailing

Errors and Omissions:•Reduced errors on labeling and design•Better design•“What you see is what you get”

•Data derived from the model•Construction Docs derived from model•No “tricking” model to get desired results

© 2008 Autodesk

Questions?